SWIX F4-23-100. F4 has a sponge foam applicator on one side of the bottle for applying wax, and a felt pad on the other side for polishing. A handy bottle to carry in your pocket. Apply a thin layer over the base surface. Let it dry for approx. 2 minutes. Finish by polishing with the felt pad. Apply F4 to the steel edges when storing your skis or board after the season. This prevents the edges rusting. Fluor free.